Earnings per Share (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended	9 Months Ended
	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Sep. 30, 2015	Jun. 30, 2016	Sep. 30, 2016	Sep. 30, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Income from continuing operations	$ 13,786	$ 16,715	$ 14,105	$ 13,632	$ 30,820	$ 41,427	$ 23,256
Loss from discontinued operations	0			0		0	(28)
Net income	$ 13,786	$ 18,612	$ 9,029	$ 13,632	$ 27,641	$ 41,427	$ 23,228
Weighted average shares outstanding	31,579,000			31,242,000		31,493,000	31,214,000
Common stock options and restricted stock (in shares)	597,000			316,000		512,000	265,000
Weighted average shares outstanding – Diluted	32,176,000			31,558,000		32,005,000	31,479,000
Common shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from earnings per share calculation (in shares)	690,000			759,000		621,000	567,000